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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef NU_CACHED_SOURCE_2_H_
     18 
     19 #define NU_CACHED_SOURCE_2_H_
     20 
     21 #include <media/stagefright/foundation/ABase.h>
     22 #include <media/stagefright/foundation/AHandlerReflector.h>
     23 #include <media/stagefright/DataSource.h>
     24 
     25 namespace android {
     26 
     27 struct ALooper;
     28 struct PageCache;
     29 
     30 struct NuCachedSource2 : public DataSource {
     31     NuCachedSource2(
     32             const sp<DataSource> &source,
     33             const char *cacheConfig = NULL,
     34             bool disconnectAtHighwatermark = false);
     35 
     36     virtual status_t initCheck() const;
     37 
     38     virtual ssize_t readAt(off64_t offset, void *data, size_t size);
     39 
     40     virtual void disconnect();
     41 
     42     virtual status_t getSize(off64_t *size);
     43     virtual uint32_t flags();
     44 
     45     virtual sp<DecryptHandle> DrmInitialization(const char* mime);
     46     virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client);
     47     virtual String8 getUri();
     48 
     49     virtual String8 getMIMEType() const;
     50 
     51     ////////////////////////////////////////////////////////////////////////////
     52 
     53     size_t cachedSize();
     54     size_t approxDataRemaining(status_t *finalStatus) const;
     55 
     56     void resumeFetchingIfNecessary();
     57 
     58     // The following methods are supported only if the
     59     // data source is HTTP-based; otherwise, ERROR_UNSUPPORTED
     60     // is returned.
     61     status_t getEstimatedBandwidthKbps(int32_t *kbps);
     62     status_t setCacheStatCollectFreq(int32_t freqMs);
     63 
     64     static void RemoveCacheSpecificHeaders(
     65             KeyedVector<String8, String8> *headers,
     66             String8 *cacheConfig,
     67             bool *disconnectAtHighwatermark);
     68 
     69 protected:
     70     virtual ~NuCachedSource2();
     71 
     72 private:
     73     friend struct AHandlerReflector<NuCachedSource2>;
     74 
     75     enum {
     76         kPageSize                       = 65536,
     77         kDefaultHighWaterThreshold      = 20 * 1024 * 1024,
     78         kDefaultLowWaterThreshold       = 4 * 1024 * 1024,
     79 
     80         // Read data after a 15 sec timeout whether we're actively
     81         // fetching or not.
     82         kDefaultKeepAliveIntervalUs     = 15000000,
     83     };
     84 
     85     enum {
     86         kWhatFetchMore  = 'fetc',
     87         kWhatRead       = 'read',
     88     };
     89 
     90     enum {
     91         kMaxNumRetries = 10,
     92     };
     93 
     94     sp<DataSource> mSource;
     95     sp<AHandlerReflector<NuCachedSource2> > mReflector;
     96     sp<ALooper> mLooper;
     97 
     98     Mutex mSerializer;
     99     mutable Mutex mLock;
    100     Condition mCondition;
    101 
    102     PageCache *mCache;
    103     off64_t mCacheOffset;
    104     status_t mFinalStatus;
    105     off64_t mLastAccessPos;
    106     sp<AMessage> mAsyncResult;
    107     bool mFetching;
    108     bool mDisconnecting;
    109     int64_t mLastFetchTimeUs;
    110 
    111     int32_t mNumRetriesLeft;
    112 
    113     size_t mHighwaterThresholdBytes;
    114     size_t mLowwaterThresholdBytes;
    115 
    116     // If the keep-alive interval is 0, keep-alives are disabled.
    117     int64_t mKeepAliveIntervalUs;
    118 
    119     bool mDisconnectAtHighwatermark;
    120 
    121     void onMessageReceived(const sp<AMessage> &msg);
    122     void onFetch();
    123     void onRead(const sp<AMessage> &msg);
    124 
    125     void fetchInternal();
    126     ssize_t readInternal(off64_t offset, void *data, size_t size);
    127     status_t seekInternal_l(off64_t offset);
    128 
    129     size_t approxDataRemaining_l(status_t *finalStatus) const;
    130 
    131     void restartPrefetcherIfNecessary_l(
    132             bool ignoreLowWaterThreshold = false, bool force = false);
    133 
    134     void updateCacheParamsFromSystemProperty();
    135     void updateCacheParamsFromString(const char *s);
    136 
    137     DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2);
    138 };
    139 
    140 }  // namespace android
    141 
    142 #endif  // NU_CACHED_SOURCE_2_H_
    143